Zephon had persuaded Beaus and Celation to join as well. Although a powerful figure, some of his subjects, such as the Embodiment Gris and the planet Fisar, had contested his rule. Arrogant and self-important, he made the Council wait for his presence at the seventh meeting. This allowed SSS agent Bret Vyon to knock him unconscious and tie him up so that the First Doctor could impersonate him in the meeting.

Physically, Zephon resembled a humanoid with seaweed-like, tendriledhands. A cowl usually concealed his face, but his cloak was stolen by the Doctor, revealing a similarly-tendriled head without distinguishable features.